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sinumbra lamp

[si-nuhm-bruh] /sɪˈnʌm brə/
noun
1.
an unshaded sperm-oil lamp consisting of a translucent glass globe supported on a pedestal: a form of astral lamp.
Also, sinumbral lamp.
Origin
1825-1835
1825-35; < Latin sin(e) without + umbrā shade, shadow
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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